Rn-222, Rn-220 AND THEIR PROGENIES MEASURED IN THE AIR OF DIFFERENT DWELLINGS AND WORKPLACES AND RESULTING ALPHA RADIATION DOSES TO THE EYES OF INDIVIDUALS

摘要

In order to assess radiation doses to the eyes of individuals, concentrations of Rn-222, Rn-220 and their decay products were measured in different dwelling rooms, cafe rooms and vehicle repair shops by using two different types of solid state nuclear track detectors (SSNTDs). The influence of building materials, pollution and ventilation rate on radon and thoron alpha-activities inside the studied locations has been investigated. A new dosimetric model was developed for evaluating radiation doses to the eyes of individuals due to alpha particles emitted by the radon and thoron series in the air of the studied dwelling rooms, cafe rooms, and vehicle repair shops. The influence of the radon and thoron activities in the air of the studied locations, as well as exposure time on committed equivalent dose to the eyes of individuals, was investigated. A maximum value of the committed equivalent dose to the eyes of individuals due to alpha particles emitted by the radon and thoron series was found equal to 0.1 mSv y(-1) cm(-2). Committed equivalent dose to the eyes of individuals due to the diffusion of the Rn-222 and Rn-220 gases present in ambient air of the studied locations has been evaluated.